Id sure love to know where you got that info. As i said there is a court case that states the ability to turn your pistol into a rife is perfectly legal. As long as the short bbl is not on at the same time as the stock
I beleive there is a letter from BATF clarifing that ANY buffer tube is legal on a pistol. You just cant have the stock on the tube
This is legal fact. These forums are riff with personal conjecture and conclusions not based in fact.
The case is Thompson/Center vs. US
SHORT version is avail with a quick search
Not trying to argue with you but the facts are other then you are stating